• Execute the backfill REST API endpoint filtered by payg product ID.

• Ensure processing is limited to the specified product scope.

• Run relevant Gabi queries on the updated data set.

• Perform EXPLAIN ANALYZE to validate query plans and index usage.

• Capture execution results and observations.

Acceptance Criteria

• REST endpoint runs successfully for the specified payg product ID only.

• No unintended data changes outside the target product.

• EXPLAIN ANALYZE is executed on relevant Gabi queries.

• Expected indexes are used with no performance regression.

• Results and findings are documented and reviewed.